I ______on the door for ten minutes now without an answer.A、was knockingB、am kn

游客2025-03-17 25

问题 I ______on the door for ten minutes now without an answer.

选项 A、was knocking
B、am knocking
C、knocking
D、have been knocking

答案 D

解析本题测试时态。本句的意思是： “我直到现在敲了 10分钟门也没人回答。”“have been doing”是现在完成进行时，表示从过去某一时间开始持续到现在的动作。例如：He has been waiting for you for the whole morning，(他等了你整整一个上午了。)

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I ______on the door for ten minutes now without an answer.A、was knockingB、am kn

Mostpeopleagreethattaxesmustbepaid.Governmentcouldn’trunwithoutm

Mostpeopleagreethattaxesmustbepaid.Governmentcouldn’trunwithoutm

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Iobjected______themeetingwithouthim.A、tohaveB、tohavingC、havingD、have

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Thebookwas(sobored)thatI(returnedit)(tothelibrary)(withoutfinishing

Withoutapassport,leavingthecountryis______.A、inquestionB、withoutquesti

Ifyouthinkthatyoucan’thaveagoodtimewithoutspendingalotofmoney,re

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正常成人解剖无效腔的容积约为()A.100ml B.125ml C.15

三要素法可适用于任何电路分析瞬变过程。（）

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